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Posted on 25 April 2019

Fuse Placement in Typical Converter Circuits

 

 

 

 

 

 

 

 

The article "Semiconductor Fuses – General" describes some of the fundamental principles that guide the positioning of fuses in power electronic circuits. Below are several examples of how these principles are implemented in typical converter circuits.

 

Phases Bridge

 

Phases bridges have many different kinds of applications such as DC motor drive, battery chargers, DC supply for PWM AC motor drive etc.
If the motor drive regenerates energy back to the network it can be located as follows: Fuses F1 in the arms or Fuses F2 + F3
If the motor does not regenerate energy back to the network fuses can be fitted in F2 or in F3.

 

 

 

 

 

 

 

Phases Bridge with Several Semiconductors in Parallel per Arm

 

 

This converter is used in high power electrolysis industry for the production of aluminium, chlorine, etc. It can also be used in substation rectifiers for metros and tramways. Fuses can only be fitted in the arms.

 

 

 

 

 

 

 

 

Soft Starter or Static Switch

 

 

In most cases fuses are in F2 only. For some very difficult cases fuses are in the F1 position only.

 

 

 

 

 

 

 

Double Y with Interphase Transformer Rectifier

 

 

This converter is used in equipment for electrolysis and electroplating, and in motor drives. Fuses are in F1.

 

 

 

 

 

 

 

 

 

 

Double Y with Interphase Transformer Rectifier with Several Semiconductors in Parallel per Arm.

 

 

This converter is used, for example, in high power electrolysis industry for the production Aluminium, Chlorine etc… Fuses F1 must be fitted only in the arms.

 

 

 

 

 

 

 

 

Generic Inverter

 

This is the DC to AC part of an AC motor drive or VVVF (Variable Voltage & Variable Frequency drive).
It is as well the DC to AC part of an UPS. Fuses can be in F2 or in F1.

 

 

 

 

 

 

 

 

For more information, please read:

Semiconductor Fuses – General

Semiconductor Fuses: Terms and Explanations

Time-Current Characteristic for Fuses

Introduction to Current Rating and I²t for Fuses

I²t Curves and Operating Times of Fuses

Dimensioning Semiconductor Fuses

 

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4 Responses

  1. avatar Sandesh Pradhna says:

    Nice details.
    Diagrams helps a lot in understanding the concept.
    Pl add more explanations on WHY fuses at these positions ?
    This will help fresh graduates to know the importance & professionals to review the college days & stick to principles.

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  2. avatar Mersen says:

    Hello Sandesh,

    have you read this article as well: http://www.powerguru.org/2012/04/20/semiconductor-fuses-general/

    which should explain in the lower part the reasoning for the positions of the fuses.

    Do you think that we should add more? We would be interested also in your proposals ...

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  3. avatar Sandesh Pradhna says:

    Yes Sir,
    Now I have seen the said article. It was not seen before.
    These two clubed / brought together will make a nice introduction on FUSE PROTECTIONS.

    The next thing required is their i2t rating & fusing time logistics v/s devices to be protected.

    thanks a lot.

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    • avatar Mersen says:

      Hello Sandesh,

      Thank you for the valuable feedback. We added a link at the top of the article refering readers to the general information on fuse placement. We also added links in the reading suggestions at the bottom to articles that address the other topics you pointed out.

      We look forward to hearing more of your suggestions.

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